I just dealt with this when setting up my WS-2000 for the first time. It turned out to be a type-o in the MAC Address. I deleted and re-entered the new device three times. On the fourth time, I painstakingly set the weather station up character-by-character and found my mistake in the MAC. Interestingly enough I was still getting the "This looks good prompt" (or something close to this) from the Ambient Server. Everything came up running great. When you solve the issue please update this thread for others to know how you solved your problem. Thanks and good luck, Dennis!
Jack